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From the following data, the heat of for...

From the following data, the heat of formation of
`Ca(OH)_(2 (s)) ` at `18^(@) C` is …………..kcal .
`CaO_((s)) + H_(2) O_((l)) to Ca(OH) _(2 (s))` ,
`Delta H_(18^(@) C) = - 15.26 kcal " " …. (i)`
`H_(2) O_((l)) to H_(2 (g)) + (1)/(2) O_(2 (g)) ,`
`Delta H_(18^(@) C) = 68.37 kcal " " .... (ii)`
`Ca_((s)) + (1)/(2) O_(2 (g)) to CaO_((s)) , Delta H^(18^(@) C) = -151.80 kcal " " ... (iii) `

A

`-98.69`

B

`-235.43`

C

`194.91`

D

`98.69`

Text Solution

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The correct Answer is:
B
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From the following data, the heat of formation of Ca(OH)_(2 (g)) at 18^(@) C is ……….. Kcal : CaO_((s)) + H_(2) O _((l)) to Ca(OH)_(2 (s)) , Delta H_(18^(@) C) = -15.26 kcal " " …. (i) H_(2) O_((l)) to H_(2 (g)) + (1)/(2) O_(2 (g)) , DeltaH _(18^(@) C) = 68.37 kcal " " ... (ii) Ca_((s)) + (1)/(2) O_(2(g)) to CaO_((s)), DeltaH_(18^(@) C) = -151.80 kcal " " .... (iii)

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